Merge tag 'for_3.7-omap_device' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm into devel-omap-device

Updates for omap_device layer for v3.7.

Allows omap_device layer to keep track of driver bound status in order
to make more intelligent decisions about idling unused devices.

2 files changed, 53 insertions, 5 deletions

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 4327b2c90c3..e7259c0d33e 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/arch/arm/plat-omap/include/plat/omap_device.h
@@ -60,6 +60,7 @@ extern struct dev_pm_domain omap_device_pm_domain;
  * @_dev_wakeup_lat_limit: dev wakeup latency limit in nsec - set by OMAP PM
  * @_state: one of OMAP_DEVICE_STATE_* (see above)
  * @flags: device flags
+ * @_driver_status: one of BUS_NOTIFY_*_DRIVER from <linux/device.h>
  *
  * Integrates omap_hwmod data into Linux platform_device.
  *
@@ -73,6 +74,7 @@ struct omap_device {
 	struct omap_device_pm_latency	*pm_lats;
 	u32				dev_wakeup_lat;
 	u32				_dev_wakeup_lat_limit;
+	unsigned long			_driver_status;
 	u8				pm_lats_cnt;
 	s8				pm_lat_level;
 	u8				hwmods_cnt;
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index c490240bb82..0f519829e79 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -385,17 +385,21 @@ static int _omap_device_notifier_call(struct notifier_block *nb,
 				      unsigned long event, void *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od;
 
 	switch (event) {
-	case BUS_NOTIFY_ADD_DEVICE:
-		if (pdev->dev.of_node)
-			omap_device_build_from_dt(pdev);
-		break;
-
 	case BUS_NOTIFY_DEL_DEVICE:
 		if (pdev->archdata.od)
 			omap_device_delete(pdev->archdata.od);
 		break;
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (pdev->dev.of_node)
+			omap_device_build_from_dt(pdev);
+		/* fall through */
+	default:
+		od = to_omap_device(pdev);
+		if (od)
+			od->_driver_status = event;
 	}
 
 	return NOTIFY_DONE;
@@ -752,6 +756,10 @@ static int _od_suspend_noirq(struct device *dev)
 	struct omap_device *od = to_omap_device(pdev);
 	int ret;
 
+	/* Don't attempt late suspend on a driver that is not bound */
+	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
+		return 0;
+
 	ret = pm_generic_suspend_noirq(dev);
 
 	if (!ret && !pm_runtime_status_suspended(dev)) {
@@ -1125,3 +1133,41 @@ static int __init omap_device_init(void)
 	return 0;
 }
 core_initcall(omap_device_init);
+
+/**
+ * omap_device_late_idle - idle devices without drivers
+ * @dev: struct device * associated with omap_device
+ * @data: unused
+ *
+ * Check the driver bound status of this device, and idle it
+ * if there is no driver attached.
+ */
+static int __init omap_device_late_idle(struct device *dev, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od = to_omap_device(pdev);
+
+	if (!od)
+		return 0;
+
+	/*
+	 * If omap_device state is enabled, but has no driver bound,
+	 * idle it.
+	 */
+	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
+		if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
+			dev_warn(dev, "%s: enabled but no driver.  Idling\n",
+				 __func__);
+			omap_device_idle(pdev);
+		}
+	}
+
+	return 0;
+}
+
+static int __init omap_device_late_init(void)
+{
+	bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
+	return 0;
+}
+late_initcall(omap_device_late_init);